[....] Starting file context maintaining daemon:[ 15.401431] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.807845] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 22.153483] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 22.910533] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) [ 34.920693] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) Warning: Permanently added '10.128.0.56' (ECDSA) to the list of known hosts. [ 40.333123] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) executing program [ 40.432667] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff83307d8e [ 40.432667] [ 40.443702] CPU: 0 PID: 3323 Comm: syzkaller911762 Not tainted 4.4.112-g5f6325b #28 [ 40.451468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.460799] 0000000000000000 64554547b14cd94c ffff8800b4117658 ffffffff81d0579d [ 40.468881] ffffffff83843020 ffff8800b4117730 00000000000005b4 ffff8801cc840064 [ 40.476855] 0000000000000040 ffff8800b4117720 ffffffff81419e6a 0000000041b58ab3 [ 40.484831] Call Trace: [ 40.487394] [] dump_stack+0xc1/0x124 [ 40.492733] [] panic+0x1aa/0x388 [ 40.497734] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 40.504637] [] ? ip_mc_output+0x980/0x980 [ 40.510405] [] ? ip_fragment.constprop.49+0x200/0x200 [ 40.517215] [] ? ip6_xmit+0x170e/0x1ad0 [ 40.522810] [] ? __stack_chk_fail+0xa/0x30 [ 40.528665] [] ? ip6_xmit+0x170e/0x1ad0 [ 40.534258] [] __stack_chk_fail+0x22/0x30 [ 40.540035] [] ip6_xmit+0x170e/0x1ad0 [ 40.545456] [] ? save_trace+0xe0/0x270 [ 40.550964] [] ? __alloc_pages_direct_compact+0x250/0x250 [ 40.558127] [] ? ip6_finish_output2+0x1c60/0x1c60 [ 40.565092] [] ? __lock_is_held+0xa1/0xf0 [ 40.570868] [] ? ipv4_dst_check+0x111/0x160 [ 40.576811] [] ? ip6_forward_finish+0x150/0x150 [ 40.583101] [] inet6_csk_xmit+0x246/0x480 [ 40.588882] [] ? inet6_csk_xmit+0x100/0x480 [ 40.594822] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 40.601373] [] ? udp6_set_csum+0x336/0xa80 [ 40.607230] [] l2tp_xmit_skb+0xc2f/0xea0 [ 40.612923] [] pppol2tp_sendmsg+0x584/0x7f0 [ 40.618869] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 40.625349] [] ? pppol2tp_release+0x310/0x310 [ 40.631466] [] sock_sendmsg+0xca/0x110 [ 40.636972] [] ___sys_sendmsg+0x6c1/0x7c0 [ 40.642742] [] ? copy_msghdr_from_user+0x550/0x550 [ 40.649304] [] ? __lock_is_held+0xa1/0xf0 [ 40.655073] [] ? check_preemption_disabled+0x3b/0x200 [ 40.661888] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 40.668874] [] ? _raw_spin_unlock+0x2c/0x50 [ 40.674820] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 40.681807] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 40.688545] [] ? __fget_light+0xa1/0x1e0 [ 40.694224] [] ? __fdget+0x18/0x20 [ 40.699385] [] __sys_sendmsg+0xd3/0x190 [ 40.704981] [] ? SyS_shutdown+0x1b0/0x1b0 [ 40.710757] [] ? __do_page_fault+0x380/0xa00 [ 40.716789] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 40.723598] [] SyS_sendmsg+0x2d/0x50 [ 40.728933] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 40.735968] Dumping ftrace buffer: [ 40.739515] (ftrace buffer empty) [ 40.743196] Kernel Offset: disabled [ 40.746812] Rebooting in 86400 seconds..